You're confusing market rate with employee value. If an employee produces $100 worth of goods per hour (after non-labour expenses), that employee is worth $100 an hour. It doesn't matter if the market rate for that job is only $12 an hour.
If that's not the case and your production is separable from the rest of the system, that does set a floor for your market rate because you can just do that on your own and keep the money instead.